File, rasp, or like tool



Dec.'l8, 1'928.

E.v FURLER TILE, RASP, OR LIKE TOOL Filed Nv. 4, 1926 Patented Dec. 18,1928."

UNITED STATES EMIL FURLER, OF ZURICH, SWITZERLAND. Y

Finn,v RAsP, on LIKE .Toon

Application kledyNoivember 4, 1926, Sexia1 No. 146,217, andinSwitzerland November 15, 1925.

The present invention'relates toles, rasps or like tools.

The files known up to now are made of` now usually cut and to harden itby a spe- 'cial hardening process whereupon the sov formed file may bevmounted on any suitable body,.for instance on to the rim of a rotary jdisk, to a bar of wood or of metal and so on. The iron piece of whichthe file is made may invention ina section,

be fiat, or'eurved lengthwise or crosswise, it. maybe a tube ofcireularor any other crosssection.

The invention further consists of details of construction, whichtogether with the fea-Mv tures iirst mentioned, will be betterunderstood by reference to the drawing.

In the drawing v Fig. l shows a rotary tool according to the vFig. 2isla face view thereof, y

Fig. 3 shows as another tool acco'rdingrto this invention altubular ilein longitudinal section. l

The tool vaccording .to Figs. l and 2 come prises two circular disks 2,inounted 0.11 a shaft l and firmly held thereon by means of a nut 4fscrew-'ed on to a screw threaded per` tion 8 ofthe shaft 1 which nut 4presses the disks on to a collar of shaft l.. The rims of the two disks2,v 3 are bevelled in opposite directions.

to fit the rims of the disks 2. 8. lBetween the ends of the openring 5ashort piece 7 is arranged having the saine crosssection as the ring 5.

On the two disks rests a split ring 5, the inner wall of whichisbevelled TO the said piece 7 the'ends` of a flexible, hardened forinstance easev hardenedi'ron band-filet) are fastened by. meansv ofcountersunk screws. l() in the usual manner. By tightening the v nut 4the disks 2, 3 are brought nearer each.

other and they expand the ring 5 uniformly lwhich is in any positionconcentric to the shaft l. The band 9 is tightened by eX- panding theringy andl runs concentric to the axis of rotation. The band 5 is eutwhile it is flat and is hardened by a special hard-y The file 9 is cutat eningr process. When hardened it isy bent,f

fixed to the piece 7 and then brought on to. `the disks 2, 3,

As shown in Fig. 3 :the toolmay'be made of'a thin walled tube 11 of softiron. The v of the tube l1 a handle 13 is arranged.v The vtube maybe ofcircular, rectangular or po- Y lygonal 'crosssection.

'The tube may b e filled with metal such as tube by means of saidmetal.v,y

What Ilwish to secure by U. S. Letters Patent isif f y 1 A tool of theclass described `comprising a` lile' forming an open ring, an. open ringony y'the periphery of which said file lis arranged, aI coupling piecebetween the' ends `offthe openl ring and to which the ends ofthe fileA.Y

csf

y lead and the handle may be `fastened to the i i beveled onits innerperiphery so that move-v l nient of said discs toward each other causessaid ring tobe diainetricallyk1 expanded, a

shaft onwhieh said dises are mounted 'and means coaeting with the shaftsto move the discs toward land from each other. A e In witnesswhereof I`affix my' signature.

^ Y EMIL FURLVER.

